六级冲刺练习：阅读（142）
<p> 11 <span word="sense">sense</span>: <span word="the">the</span> <span word="surface">surface</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="is">is</span> <span word="limited">limited</span>, 12 <span word="absolute">absolute</span> <span word="scarcity">scarcity</span>, <span word="but">but</span> <span word="the">the</span> <span word="scarcity">scarcity</span> <span word="that">that</span> <span word="concerns">concerns</span> <span word="economists">economists</span> <span word="is">is</span> <span word="the">the</span> <span word="relative">relative</span> <span word="scarcity">scarcity</span> <span word="of">of</span> <span word="resources">resources</span> <span word="in">in</span> 13 <span word="uses">uses</span>. <span word="Materials">Materials</span> <span word="used">used</span> <span word="for">for</span> <span word="one">one</span> <span word="purpose">purpose</span> <span word="cannot">cannot</span> <span word="at">at</span> <span word="the">the</span> <span word="same">same</span> <span word="time">time</span> <span word="be">be</span> <span word="used">used</span> <span word="for">for</span> <span word="other">other</span> <span word="purposes">purposes</span>; <span word="if">if</span> <span word="the">the</span> <span word="quantity">quantity</span> <span word="of">of</span> <span word="an">an</span> <span word="input">input</span> <span word="is">is</span> <span word="limited">limited</span>, <span word="the">the</span> <span word="increased">increased</span> <span word="use">use</span> <span word="of">of</span> <span word="it">it</span> <span word="in">in</span> <span word="one">one</span> <span word="manufacturing">manufacturing</span> <span word="process">process</span> <span word="must">must</span> <span word="cause">cause</span> <span word="it">it</span> <span word="to">to</span> <span word="become">become</span> <span word="less">less</span> <span word="available">available</span> <span word="for">for</span> <span word="other">other</span> <span word="uses">uses</span>.</p><p> <span word="The">The</span> <span word="cost">cost</span> <span word="of">of</span> <span word="a">a</span> <span word="product">product</span> <span word="in">in</span> 14 <span word="of">of</span> <span word="money">money</span> <span word="may">may</span> <span word="not">not</span> <span word="measure">measure</span> <span word="its">its</span> <span word="true">true</span> <span word="cost">cost</span> <span word="to">to</span> <span word="society">society</span>. <span word="The">The</span> <span word="true">true</span> <span word="cost">cost</span> <span word="of">of</span>, <span word="say">say</span>, <span word="the">the</span> <span word="construction">construction</span> <span word="of">of</span> <span word="a">a</span> <span word="supersonic">supersonic</span> <span word="jet">jet</span> <span word="is">is</span> <span word="the">the</span> <span word="value">value</span> <span word="of">of</span> <span word="the">the</span> <span word="schools">schools</span> <span word="and">and</span> <span word="refrigerators">refrigerators</span> <span word="that">that</span> <span word="will">will</span> <span word="never">never</span> <span word="be">be</span> <span word="built">built</span> <span word="as">as</span> <span word="a">a</span> <span word="result">result</span>. <span word="Every">Every</span> <span word="act">act</span> <span word="of">of</span> <span word="production">production</span> <span word="uses">uses</span> <span word="up">up</span> <span word="some">some</span> <span word="of">of</span> <span word="societys">societys</span> <span word="available">available</span> <span word="resources">resources</span>; <span word="it">it</span> <span word="means">means</span> <span word="the">the</span> <span word="foregoing">foregoing</span> <span word="of">of</span> <span word="an">an</span> <span word="opportunity">opportunity</span> <span word="to">to</span> <span word="produce">produce</span> <span word="something">something</span> <span word="else">else</span>. <span word="In">In</span> <span word="deciding">deciding</span> <span word="how">how</span> <span word="to">to</span> <span word="use">use</span> <span word="resources">resources</span> <span word="most">most</span> <span word="effectively">effectively</span> <span word="to">to</span> 15 <span word="the">the</span> <span word="wants">wants</span> <span word="of">of</span> <span word="the">the</span> <span word="community">community</span>, <span word="this">this</span> <span word="opportunity">opportunity</span> <span word="cost">cost</span> <span word="must">must</span> 16 <span word="be">be</span> <span word="taken">taken</span> <span word="into">into</span> <span word="account">account</span>.</p><p> <span word="In">In</span> <span word="a">a</span> <span word="market">market</span> 17 <span word="the">the</span> <span word="price">price</span> <span word="of">of</span> <span word="a">a</span> <span word="commodity">commodity</span> <span word="and">and</span> <span word="the">the</span> <span word="quantity">quantity</span> <span word="supplied">supplied</span> <span word="depend">depend</span> <span word="on">on</span> <span word="the">the</span> <span word="cost">cost</span> <span word="of">of</span> <span word="making">making</span> <span word="it">it</span>, <span word="and">and</span> <span word="that">that</span> <span word="cost">cost</span>, <span word="ultimately">ultimately</span>, <span word="is">is</span> <span word="the">the</span> <span word="cost">cost</span> <span word="of">of</span> <span word="not">not</span> <span word="making">making</span> <span word="other">other</span> <span word="goods">goods</span>. <span word="The">The</span> <span word="market">market</span> <span word="mechanism">mechanism</span> <span word="enforces">enforces</span> <span word="this">this</span> 18 . <span word="The">The</span> <span word="cost">cost</span> <span word="of">of</span>, <span word="say">say</span>, <span word="a">a</span> <span word="pair">pair</span> <span word="of">of</span> <span word="shoes">shoes</span> <span word="is">is</span> <span word="the">the</span> <span word="price">price</span> <span word="of">of</span> <span word="the">the</span> <span word="leather">leather</span>, <span word="the">the</span> <span word="labor">labor</span>, <span word="the">the</span> <span word="fuel">fuel</span>, <span word="and">and</span> <span word="other">other</span> <span word="elements">elements</span> <span word="used">used</span> <span word="up">up</span> <span word="in">in</span> <span word="producing">producing</span> <span word="them">them</span>. <span word="But">But</span> <span word="the">the</span> <span word="price">price</span> <span word="of">of</span> <span word="these">these</span> <span word="inputs">inputs</span>, <span word="in">in</span> <span word="turn">turn</span>, 19 <span word="on">on</span> <span word="what">what</span> <span word="they">they</span> <span word="can">can</span> <span word="produce">produce</span> <span word="elsewhereif">elsewhereif</span> <span word="the">the</span> <span word="leather">leather</span> <span word="can">can</span> <span word="be">be</span> <span word="used">used</span> <span word="to">to</span> <span word="produce">produce</span> <span word="handbags">handbags</span> <span word="that">that</span> <span word="are">are</span> <span word="valued">valued</span> <span word="highly">highly</span> <span word="by">by</span> <span word="consumers">consumers</span>, <span word="the">the</span> <span word="price">price</span> <span word="of">of</span> <span word="leather">leather</span> <span word="will">will</span> <span word="be">be</span> <span word="bid">bid</span> <span word="up">up</span></p><p> 20</p>
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